/* Copyright 2009 Requirements Management System 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mags.remas.view.widgets;

import java.io.Serializable;
import org.apache.commons.lang.SerializationUtils;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.TransferData;

/**
 * 
 * @author Mario Gaitan
 *
 */
public class PlainObjectTransfer extends ByteArrayTransfer {
	private static final String TYPE_NAME = "entity-transfer";
	private static final int TYPE_ID = registerType(TYPE_NAME);
	private static PlainObjectTransfer instance = new PlainObjectTransfer();
	private PlainObjectTransfer() {}
	public static PlainObjectTransfer getInstance () {
		return instance;
	}
	public void javaToNative (Object object, TransferData transferData) {
		if(object==null) throw new RuntimeException("Object to transfer by PlainObjectTransfer can't be null");
		if(!(object instanceof Serializable)) throw new RuntimeException("Object to transfer is not Serializable");
		if (isSupportedType(transferData)) {
			super.javaToNative(SerializationUtils.serialize((Serializable)object), transferData);
		}
	}
	public Object nativeToJava(TransferData transferData){	
		if (isSupportedType(transferData)) {
			byte[] buffer = (byte[])super.nativeToJava(transferData);
			if (buffer == null) throw new RuntimeException("Buffer received in PlainObjectTransfer is null");
			return SerializationUtils.deserialize(buffer);
		} 
		return null;
	}
	protected String[] getTypeNames(){
		return new String[]{TYPE_NAME};
	}
	protected int[] getTypeIds(){
		return new int[] {TYPE_ID};
	}
}
